George b



(No Model.)

213) TMMM/ G. B. PRALEY. ELECTRIC HEATER.

Patented Oct. 13, 1896.

UNITED STATES PATENT OFFICE.

GEORGE E. FRALEY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY

DIRECT AND MESNE ASSIGNMENTS, TO THE GLOBE ELECTRIC HEAT- ING COMPANY.

ELECTRIC HEATER.

SPECIFICATION forming part of Letters Patent No. 569,278, dated October13, 1896.

Application filed July 11,1896. Serial No. 598,858. (No model.)

To all whom it may concern:

Be it known that I, GEORGE B. FRALEY, of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented certain new anduseful Improvements in Electrical Heaters; and I do hereby declare thatthe following is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it appertains tomake and use the same, reference be-- ing had to the accompanyingdrawings, and to the letters of reference marked thereon, which formpart of this specification.

This invention relates to certain new and useful improvements inelectrical heaters.

The object of the invention is to provide a highly-efficient andeconomical heater, simple, cheap, and durable in construction andcomposed of a minimum number of parts.

A further object of the invention is to provide means for quickly andeasily removing worn or burned parts and replacingthem with perfectsimilar parts.

In the drawings, Figure 1 is a central longitudinal section showing theinner cylinder in side elevation. Fig. 2 is a central longitudinalsection through the entire heater. Fig. 3 is an end View of the heater.

Referring by letter to the drawings, a indicates the outer or metalliccylinder provided with the supports Z) therefor. c is a series ofopenings in the bottom of said cylinder, and d are sinn'il'arhol'es inthe top' thereof to permit of a free circulation of air.

e is a cylinder made of fireproof material, having the flanges f ateither end to snugly fit within the metallic perforated cylinder to.

The cylinder e is provided at or near its center with a wall g, formingtwo chambers thereof to prevent a draft through the cylinder and also toprevent the entire volume of heat passing out of one end thereof shouldeither end be raised higher than the other. it are a series of openingsthrough the lower wall of the said fireproof cylinder 6, opening intothe two chambers of said cylinder. These openings register with severalof the openings 0 in the metallic cylinder or casing a. The holes oropenings h are surrounded with a wall or inclosure formed integral withthe cylinder 6 and adapted to snugly fit the bottom wall of the metalliccylinder or casing a. This wall or inclosure forms a channel or guidefor the cold air to the several chambers of the inner or fireproofcylinder 6. In constructing this inner fireproof cylinder it is moldedpreferably round and encircled with several coils of wire, beginning atthe comm on binding-post 2', each stand of coiled wire at its other endhaving its own binding-post, such as j. Any number of these wires may beemployed and used, if so desired, so that when one is burned out aconnection can be made to any of the other posts, and so on until theyhave all become useless, when the cylinder may be removed and anothersubstituted at a very slight cost. \Vhen an inner or fireproof cylinderis to be removed, it is only necessary to remove the circular cap ateither end of the casing and it can be easily and quickly pushed out.Over the several strands of coiled wire around the inner cylinder I forma coating of compound composed principally of powdered talc, silicate ofsoda, and water in the proportion desired. Mineral wool (made fromsilicious rock) may also be added. This is mixed into a plastic stateand applied as desired. If made thin, it may be put on with a brush likepaint, when several coats will be necessary, or it may be made thickerand applied by hand and allowed to dry; Otherwise it would bubble andform cells in the coating when the heat is applied. This coating being agood conductor of heat allows the\ full power of the current to come incontact with the air circulating between the casing a and the cylinder6, and at the same time keeps the wires in perfect condition andprevents corroding or oxidizing.

It will be readily seen that by means of the openings 0 and h a freecirculation of air is had both within and around the cylinder 6. Therebythe effectiveness of the heater is increased.

I do not wish to limit myself to the exact construction hereindescribed, but consider myself entitled to all changes that fall withinthe spirit and scope of my invention.

Having thus fully described my invention, what I claim is- 1. Anelectrical heater consisting of a perforated metallic casing open atboth ends, a

lower wall of the casing, llang'es at each end of the cylinder closingthe ends of the casing and forming'a chamber between the inner cylinderand the casing, substantially as described.

ln testimony that I claim the foregoing as my own I allix. my signaturein presence of two witnesses.

GEORGE l FRALEY.

lVitnesses:

JOHN F. TURNER, A. B. PAULSON.

